Seasonal and interannual variability in the diet of young and subadult male Antarctic fur seals as revealed by stable C and N isotope ratios
Detailed knowledge of marine mammal diet is critical to understand their ecological roles and for the adequate management of marine resources. Antarctic fur seals ( Arctocephalus gazella) in the Southern Atlantic Ocean rely largely on Antarctic krill ( Euphausia superba) during the summer months, bu...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
2023
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Online Access: | http://dx.doi.org/10.1139/cjfas-2022-0145 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2022-0145 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2022-0145 |
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crcansciencepubl:10.1139/cjfas-2022-0145 2023-12-17T10:20:56+01:00 Seasonal and interannual variability in the diet of young and subadult male Antarctic fur seals as revealed by stable C and N isotope ratios Drago, Massimiliano Llorach, Celia Santa Cruz, Unai Ormazabal Zenteno-Devaud, Lisette Rebolledo, Lorena Rita, Diego Gazo, Manel Cardona, Luis 2023 http://dx.doi.org/10.1139/cjfas-2022-0145 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2022-0145 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2022-0145 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 80, issue 1, page 69-84 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2023 crcansciencepubl https://doi.org/10.1139/cjfas-2022-0145 2023-11-19T13:38:16Z Detailed knowledge of marine mammal diet is critical to understand their ecological roles and for the adequate management of marine resources. Antarctic fur seals ( Arctocephalus gazella) in the Southern Atlantic Ocean rely largely on Antarctic krill ( Euphausia superba) during the summer months, but their winter diet remains largely unknown. Here, stable carbon and nitrogen isotope ratios in whiskers and blood of young (2–3 years old) and subadult (4–7 years old) Antarctic fur seal males from the South Shetland Islands were used to assess the seasonal and interannual changes in the krill contribution to their diet. The stable isotope ratios revealed that krill dominated the diet of young and subadult male Antarctic fur seals year-round, with penguins, and not fish, as the second major prey, regardless of year and season. The year-round reliance of young and subadult male Antarctic fur seals on krill should be considered for ecosystem-based fisheries management, as they represent the bulk of the fur seal population remaining off Antarctica during the winter months. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Antarctica Arctocephalus gazella Euphausia superba South Shetland Islands Canadian Science Publishing (via Crossref) Antarctic South Shetland Islands Canadian Journal of Fisheries and Aquatic Sciences 80 1 69 84 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Drago, Massimiliano Llorach, Celia Santa Cruz, Unai Ormazabal Zenteno-Devaud, Lisette Rebolledo, Lorena Rita, Diego Gazo, Manel Cardona, Luis Seasonal and interannual variability in the diet of young and subadult male Antarctic fur seals as revealed by stable C and N isotope ratios |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Detailed knowledge of marine mammal diet is critical to understand their ecological roles and for the adequate management of marine resources. Antarctic fur seals ( Arctocephalus gazella) in the Southern Atlantic Ocean rely largely on Antarctic krill ( Euphausia superba) during the summer months, but their winter diet remains largely unknown. Here, stable carbon and nitrogen isotope ratios in whiskers and blood of young (2–3 years old) and subadult (4–7 years old) Antarctic fur seal males from the South Shetland Islands were used to assess the seasonal and interannual changes in the krill contribution to their diet. The stable isotope ratios revealed that krill dominated the diet of young and subadult male Antarctic fur seals year-round, with penguins, and not fish, as the second major prey, regardless of year and season. The year-round reliance of young and subadult male Antarctic fur seals on krill should be considered for ecosystem-based fisheries management, as they represent the bulk of the fur seal population remaining off Antarctica during the winter months. |
format |
Article in Journal/Newspaper |
author |
Drago, Massimiliano Llorach, Celia Santa Cruz, Unai Ormazabal Zenteno-Devaud, Lisette Rebolledo, Lorena Rita, Diego Gazo, Manel Cardona, Luis |
author_facet |
Drago, Massimiliano Llorach, Celia Santa Cruz, Unai Ormazabal Zenteno-Devaud, Lisette Rebolledo, Lorena Rita, Diego Gazo, Manel Cardona, Luis |
author_sort |
Drago, Massimiliano |
title |
Seasonal and interannual variability in the diet of young and subadult male Antarctic fur seals as revealed by stable C and N isotope ratios |
title_short |
Seasonal and interannual variability in the diet of young and subadult male Antarctic fur seals as revealed by stable C and N isotope ratios |
title_full |
Seasonal and interannual variability in the diet of young and subadult male Antarctic fur seals as revealed by stable C and N isotope ratios |
title_fullStr |
Seasonal and interannual variability in the diet of young and subadult male Antarctic fur seals as revealed by stable C and N isotope ratios |
title_full_unstemmed |
Seasonal and interannual variability in the diet of young and subadult male Antarctic fur seals as revealed by stable C and N isotope ratios |
title_sort |
seasonal and interannual variability in the diet of young and subadult male antarctic fur seals as revealed by stable c and n isotope ratios |
publisher |
Canadian Science Publishing |
publishDate |
2023 |
url |
http://dx.doi.org/10.1139/cjfas-2022-0145 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2022-0145 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2022-0145 |
geographic |
Antarctic South Shetland Islands |
geographic_facet |
Antarctic South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Antarctica Arctocephalus gazella Euphausia superba South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Antarctica Arctocephalus gazella Euphausia superba South Shetland Islands |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 80, issue 1, page 69-84 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2022-0145 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
80 |
container_issue |
1 |
container_start_page |
69 |
op_container_end_page |
84 |
_version_ |
1785527770685636608 |